package com.atguigu.gulimall.cart.controller;

import com.atguigu.gulimall.cart.intercepter.CartInterceptor;
import com.atguigu.gulimall.cart.service.CartService;
import com.atguigu.gulimall.cart.vo.Cart;
import com.atguigu.gulimall.cart.vo.CartItem;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import java.util.List;
import java.util.concurrent.ExecutionException;

@Controller
public class CartController {

    @Autowired
    CartService cartService;

    /**
     * 浏览器有一个cookie ； 京东会存一个user-key：标识用户身份：一个月过期
     * 如果第一次使用jd的购物车功能，都会给一个临时的用户身份
     * 浏览器以后保存，每次访问都会带上cookie
     *
     * 登录了session里有
     * 没登录，就按cookie里带来user-key来做
     * 如果没有临时用户，还要帮忙创建一个临时用户
     * @return
     */
    @GetMapping("/cart.html")
    public String cartListPage(Model model) throws ExecutionException, InterruptedException {
        //1、快速得到用户信息，到底是登录没登录，用jdk提供的ThreadLocal
        /*UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        System.out.println(userInfoTo);*/

        Cart cart = cartService.getCart();
        model.addAttribute("cart",cart);
        return "cart";
    }

    /**
     * 添加商品到购物车
     * RedirectAttributes：
     *  ra.addFlashAttribute()  将数据放在session里面可以在页面取出，但是只能取一次
     *  ra.addAttribute("skuId",skuId);   将数据放在url后  http://cart.gulimall.com/addToCartSuccess.html?skuId=22
     * @return
     */
    @GetMapping("/addToCart")
    public String addToCart(@RequestParam("skuId") Long skuId,
                            @RequestParam("num")Integer num,
                            RedirectAttributes ra) throws ExecutionException, InterruptedException {
        cartService.addToCart(skuId,num);
//        model.addAttribute("skuId",skuId);
        ra.addAttribute("skuId",skuId);
        //因为添加购物车一直访问http://cart.gulimall.com/addToCart?skuId=23&num=5，造成多次添加，得防止
        /**
         * 重定向方式防止无限次刷新表单提交
         */
        return "redirect:http://cart.gulimall.com/addToCartSuccess.html";
    }

    /**
     * 跳转到成功页，就算无限刷新，也只是查一下
     * @param skuId
     * @param model
     * @return
     */
    @GetMapping("/addToCartSuccess.html")
    public String addToCartSuccessPage(@RequestParam("skuId") Long skuId,Model model){
        //重定向到成功页面，再次查询购物车数据即可
        CartItem item = cartService.getCartItem(skuId);
        model.addAttribute("item",item);
        return "success";
    }

    /**
     * 勾选某个购物项
     */
    @GetMapping("checkItem")
    public String checkItem(@RequestParam("skuId") Long skuId,@RequestParam("check")Integer check){
        cartService.checkItem(skuId,check);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    /**
     * 修改购物项数量
     */
    @GetMapping("/countItem")
    public String countItem(@RequestParam("skuId") Long skuId,@RequestParam("num")Integer num){
        cartService.changeItemCount(skuId,num);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    /**
     * 删除某个购物项
     */
    @GetMapping("/deleteItem")
    public String deleteItem(@RequestParam("skuId") Long skuId){
        cartService.deleteItem(skuId);
        return "redirect:http://cart.gulimall.com/cart.html";
    }

    /**
     * 获取当前用户的所有购物项
     */
    @GetMapping("/currentUserCartItems")
    @ResponseBody
    public List<CartItem> getCurrentUserCartItems(){

        return cartService.getUserCartItems();
    }
}
